lumber

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For more information on lumber, visit Britannica.com.

Background

Lumber is a generic term that applies to various lengths of wood used as construction materials. Pieces of lumber are cut lengthwise from the trunks of trees and are characterized by having generally rectangular or square cross sections, as opposed to poles or pilings, which have round cross sections.

The use of wood as a construction material predates written history. The earliest evidence of wood construction comes from a site near Nice, France, where a series of post holes seems to indicate that a hut 20 ft (6m) wide by 50 ft (15 m) long was built there 400,000 years ago using wood posts for support. The oldest wood construction found intact is located in northwest Germany, and was built about 7,300 years ago. By 500 B.C. iron axes, saws, and chisels were commonly used to cut and shape wood. The first reference to cutting wood in a sawmill, rather than using hand tools, comes from northern Europe and dates from about 375. The sawmill was powered by the flow of water.

In North America, European colonists found vast forests of trees, and wood became the principal building material. The circular saw, which had been developed in England, was introduced in the United States in 1814 and was widely used in sawmills. A large-scale bandsaw was developed and patented by Jacob R. Hoffman in 1869 and replaced the circular saw for many sawmill operations.

Lumber produced in early sawmills had varying dimensions depending on the customer's specific order or the mill's standard practice. Today, lumber pieces used in construction have standard dimensions and are divided into three categories, depending on the thickness of the piece. Lumber with nominal thicknesses of less than 2 in (5 cm) are classified as boards. Those with nominal thicknesses of 2 in (5 cm) but less than 5 in (13 cm) are classified as dimension. Those with nominal thicknesses of 5 in (12.5 cm) and greater are classified as timbers. The nominal widths of these pieces vary from 2-16 in (5-40 cm) in 1 in (2.5 cm) increments. Most rough-cut lumber pieces are dried and then finished, or surfaced, by running them through a planer to smooth all four sides. As a result, the actual dimensions are smaller than the nominal dimensions. For example, a standard two-by-four piece of dried, surfaced dimension lumber actually measures 1.5 in (3.8 cm) by 3.5 in (8.9 cm).

Pieces of lumber that are not only surfaced, but also machined to produce a specific cross sectional shape are classified as worked lumber or pattern lumber. Decorative molding, tongue-and-groove flooring, and shiplap siding are examples of pattern lumber.

Today, processing wood products is a billion-dollar, worldwide industry. It not only produces construction lumber, but also plywood, fiberboard, paper, cardboard, turpentine, rosin, textiles, and a wide variety of industrial chemicals.

Raw Materials

The trees from which lumber is produced are classified as hardwoods or softwoods. Although the woods of many hardwoods are hard, and the woods of many softwoods are soft, that is not the defining characteristic. Most hardwood trees have leaves, which they shed in the winter. Hardwood trees include oaks, maples, walnuts, cherries, and birches, but they also include balsa, which has one of the softest and lightest of all the woods. Softwood trees, on the other hand, have needles instead of leaves. They do not shed their needles in the winter, but remain green throughout the year and are sometimes called evergreens. Softwood trees include pines, firs, hemlocks, spruces, and redwoods.

Hardwoods are generally more expensive than softwoods and are used for flooring, cabinetry, paneling, doors, and trimwork. They are also extensively used to manufacture furniture. Hardwoods are available in lengths from 4-16 ft (1.2-4.8 m). Softwoods are used for wall studs, joists, planks, rafters, beams, stringers, posts, decking, sheathing, subflooring, and concrete forms. They are available in lengths from 4-24 ft (1.2-7.3 m).

Both hardwood and softwood lumber pieces are graded according to the number and size of defects in the wood. Defects include knots, holes, pitch pockets, splits, and missing pieces on the edges or corners, called wanes. These defects primarily affect the appearance, but may also affect the strength of the piece. The higher grades are called select grades. Hardwoods may also be graded as firsts or seconds, which are even higher than select. These grades have very few defects and are used for trim, molding, and finish woodwork where appearance is important. The higher the grade, the fewer the number of defects. The lower grades are called common grades and are used for general construction where the wood will be covered or where defects will not be objectionable. Common grades are designated in descending order of quality by a number such as #1 common, #2 common, and so on. Pieces of softwood common grade lumber may also be designated by an equivalent name, such as select merchantable, construction, and so on. Lumber intended for uses other than construction, such as boxes or ladders, are given other grading designations.

The Manufacturing
Process

In the United States, most trees destined to be cut into lumber are grown in managed forests either owned by the lumber company or leased from the government. After the trees have reached an appropriate size, they are cut down and transported to a lumber mill where they are cut into various sizes of lumber.

Here is a typical sequence of operations for processing trees into lumber.

Felling

• Selected trees in an area are visually inspected and marked as being ready to be cut down, or felled. If a road does not already exist in the area, one is cut and graded using bulldozers. If operations are expected to extend into the rainy season, the road may be graveled, and culverts may be installed across streams to prevent washouts.
• Most tree felling is done with gasoline-powered chain saws. Two cuts are made near the base, one on each side, to control the direction the tree will fall. Once the tree is down, the limbs are trimmed off with chain saws, and the tree is cut into convenient lengths for transportation.
• If the terrain is relatively level, diesel-powered tractors, called skidders, are used to drag the fallen tree sections to a cleared area for loading. If the terrain is steep, a self-propelled yarder is used. The yarder has a telescoping hydraulic tower that can be raised to a height of 110 ft (33.5 m). Guy wires support the tower, and cables are run from the top of the tower down the steep slopes to retrieve the felled trees. The tree sections, or logs, are then loaded on trucks using wheeled log loaders.
• The trucks make their way down the graded road and onto public highways on their way to the lumber mill. Once at the mill, giant mobile unloaders grab the entire truck load in one bite and stack it in long piles, known as log decks. The decks are periodically sprayed with water to prevent the wood from drying out and shrinking.

Debarking and bucking

• Logs are picked up from the log deck with rubber-tired loaders and are placed on a chain conveyor that brings them into the mill. In some cases, the outer bark of the log is removed, either with sharp-toothed grinding wheels or with a jet of high-pressure water, while the log is slowly rotated about its long axis. The removed bark is pulverized and may be used as a fuel for the mill's furnaces or may be sold as a decorative garden mulch.
• The logs are carried into the mill on the chain conveyor, where they stop momentarily as a huge circular saw cuts them into predetermined lengths. This process is called bucking, and the saw is called a bucking saw.

Headrig sawing large logs

• If the log has a diameter larger than 2-3 ft (0.6-0.9 m), it is tipped off the conveyor and clamped onto a moveable carriage that slides lengthwise on a set of rails. The carriage can position the log transversely relative to the rails and can also rotate the log 90 or 180 degrees about its length. Optical sensors scan the log and determine its diameter at each end, its length, and any visible defects. Based on this information, a computer then calculates a suggested cutting pattern to maximize the number of pieces of lumber obtainable from the log.
• The headrig sawyer sits in an enclosed booth next to a large vertical bandsaw called the headrig saw. He reviews the suggested cutting pattern displayed on a television monitor, but relies more on his experience to make the series of cuts. The log is fed lengthwise through the vertical bandsaw. The first cut is made along the side closest to the operator and removes a piece of wood called a slab. The outer surface of the slab has the curvature of the original tree trunk, and this piece is usually discarded and ground to chips for use in paper pulp.
• The carriage is returned to its original position, and the log is shifted sideways or rotated to make subsequent cuts. The headrig sawyer must constantly review the log for internal defects and modify the cutting pattern accordingly as each successive cut opens the log further. In general, thinner pieces destined to be made into boards are cut from the outer portion of the log where there are fewer knots. Thicker pieces for dimension lumber are cut next, while the center of the log yields stock for heavy timber pieces.

Bandsawing small logs

• Smaller diameter logs are fed through a series of bandsaws that cut them into nominal 1 in (2.5 cm), 2 in (5 cm), or 4 in (10 cm) thick pieces in one pass.

Resawing

• The large cut pieces from the headrig saw, called cants, are laid flat and moved by chain conveyor to multiple-blade bandsaws, where they are cut into the required widths and the outside edges are trimmed square. The pieces that were cut from smaller logs may also pass through multiple-blade bandsaws to cut them to width. If the pieces are small enough that they do not need further cutting, they may pass through a chipper, which grinds the uneven edges square.

Drying or seasoning

• The cut and trimmed pieces of lumber are then moved to an area to be dried, or "seasoned." This is necessary to prevent decay and to permit the wood to shrink as it dries out. Timbers, because of their large dimensions, are difficult to thoroughly dry and are generally sold wet, or "green." Other lumber may be air dried or kiln dried, depending on the required moisture content of the finished piece. Air-dried lumber is stacked in a covered area with spacers between each piece to allow air to circulate. Air-dried woods generally contain about 20% moisture. Kiln-dried lumber is stacked in an enclosed area, while 110-180°F (44-82°C) heated air is circulated through the stack. Kiln-dried woods generally contain less than 15% moisture and are often specified for interior floors, molding, and doors where minimal shrinkage is required.

Planing

• The dried pieces of lumber are passed through planers, where rotating cutting heads trim the pieces to their final dimensions, smooth all four surfaces, and round the edges.

Grade stamping and banding

• Each piece of lumber is visually or mechanically inspected and graded according to the amount of defects present. The grade is stamped on each piece, along with information about the moisture content, and a mill identification number. The lumber is then bundled according to the type of wood, grade, and moisture content, and the bundle is secured with steel bands. The bundle is loaded on a truck or train and shipped to a lumber yard for resale to customers.

Quality Control

There are very few pieces of perfect lumber. Even though great care is taken to avoid or minimize defects when sawing the wood to the required sizes, there are almost always some defects present. The number and location of these defects determines the grade of the lumber, and the purchaser must choose the grade that is appropriate for each specific application.

The Future

As the number of older trees available for logging diminishes, so does the lumber industry's ability to selectively cut pieces of lumber to the sizes needed for construction. Many of the trees being logged today are second-generation or third-generation trees that are younger and smaller in diameter than the original old-growth trees. These younger trees also contain a higher percentage of juvenile wood, which is less dimensionally stable than older wood.

To counter this trend, the lumber industry is literally taking trees apart and putting them back together again to manufacture the sizes, strengths, and stability required for construction. Actually, they have been doing this for decades in the form of plywood and glue-laminated beams, and some of the new products use similar technology.

One of the new manufactured lumber products is called parallel strand lumber. It begins much like plywood with a thin veneer of wood being peeled off a log. The veneer passes under a fiber-optic scanner that spots defects and cuts them out, sort of like an automated cookie cutter. The veneer is then dried and cut into 0.5 in (1.3 cm) wide strips. The strips are fed into one end of a machine, which coats them with a phenolic resin glue and stacks them side-to-side and end-to-end to form a solid 12 in by 17 in (30 cm by 43 cm) beam of wood. The beam is zapped with 400,000 watts of microwave energy, which hardens the glue almost instantly. As the beam emerges from the other end of the machine, it is cut into 60 ft (18.3 m) lengths. It is then further cut into various sizes of lumber, and sanded smooth. The resulting pieces are significantly stronger and more dimensionally stable than natural wood, while being attractive enough to be used for exposed beams and other visible applications.

Where to Learn More

Books

Bramwell, Martyn, ed. The International Book of Wood. Simon and Schuster, 1976.

Forest Products Laboratory. Wood Handbook: Wood as an Engineering Material. United States Department of Agriculture, 1987.

Hoadley, R. Bruce. Understanding Wood: A Craftsman's Guide to Wood Technology. The Taunton Press, 1980.

Hornbostel, Caleb. Construction Materials, 2nd Edition. John Wiley and Sons, Inc., 1991.

Vila, Bob. This Old House Guide to Building and Remodeling Materials. Warner Books, Inc., 1986.

Periodicals

Crosby, Bill. "The New Lumber." Sunset (Central West edition), November 1995, pp. 72-76.

McCafferty, Phil. "Reinventing Wood." Popular Science, May 1990, pp. 96-99, 117.

McCafferty, Phil. "New Strengths For Lumber." Popular Science, January 1992, pp. 68-69, 95.

Wardell, C. "Engineered Lumber From the Top Down." Popular Science, October 1995, p. 53.

[Article by: Chris Cavette]

Timber sawed or split into planks, boards, and similar products. Lumber can come in many forms, species, and types from a wide variety of commercial sources. Because most lumber is manufactured similarly and graded by standardized rules, it is fairly uniform throughout the United States. See also Wood products.

Lumber is manufactured from round logs primarily in rectangular shapes of different dimensions. Lumber length is recorded in actual dimensions. Width and thickness are traditionally recorded in nominal dimensions, which are somewhat more than actual dimensions. Lumber is classified by thickness into three categories: (1) board, lumber less than 38 mm (nominally 2 in.) thick; (2) dimension, lumber from 38 mm to, but not including, 114 mm (nominally 5 in.) thick; and (3) timber, lumber 114 mm (nominally 5 in.) or more in thickness in the least dimension. See also Logging.

Lumber can be produced with either a rough or surfaced (dressed) finish. Rough-sawn lumber has surface imperfections caused by the primary sawing operations. Surfaced lumber is smoothed on either one or both sides and one or both edges.

In general, the grade of a piece of lumber is based on the number, character, and location of features that may lower the strength, durability, or utility value of the wood. Lumber grading can be divided into two main categories: remanufacture “shop grade” and structural “stress grade.” Sorting of lumber for remanufacture is based on visual inspection. The wood is designated shop grade on the proportion of defect-free or clear cuttings of a certain size that can be made from a piece of lumber. The larger volume and more frequent number of clear cuttings, the higher the grade. Pieces of lumber graded for structural uses are put into classes with similar mechanical properties called stress grades. Stress grades are characterized by (1) one or more sorting criteria, (2) a set of allowable properties for engineering design, and (3) a unique grade name. The allowable properties are inferred through visual grading criteria or are determined nondestructively by machine-grading criteria.

Visual grading is the oldest stress-grading method. It is based on the premise that mechanical properties of lumber differ from mechanical properties of clear wood. Growth characteristics, which affect properties and can be seen and judged by eye, are used to sort the lumber into stress grades. Typical visual sorting criteria include density, decay, proportion of heartwood and sapwood, slope of grain, knots, shake, checks and splits, wane, and pitch pockets.

Machine-graded lumber is evaluated by a machine using a nondestructive test followed by visual grading to evaluate certain characteristics that the machine cannot or may not properly evaluate. Machine-stress-rated (MSR), machine-evaluated (MEL), and E-rated lumber are three types of machine-graded lumber. Machine-graded lumber allows for better sorting of material for specific applications in engineered structures.

Clear, straight-grained lumber can be about 50% stronger when dry than when wet. For lumber containing knots, the increase in strength with decreasing moisture content is dependent on lumber quality. For timber, often no adjustment for moisture content is made because properties are assigned on the basis of wood in the green condition. See also Wood products; Wood properties.

verb

To move heavily: clump, galumph, hulk, lump¹, stump. See move/halt.

Definition: burden
Antonyms: relieve, unburden

v

Definition: walk heavily, clumsily
Antonyms: glide

Timber sawn or split in the form of beams, boards, joists, planks, etc., esp. that which is smaller than heavy timber. Also see board, 1, dimension lumber, matched boards, and yard lumber.

Pine boards that have been treated with chemicals for protection from the fungi that cause untreated wood to decay or rot.

LearnThatWord.com is a free vocabulary and spelling program where you only pay for results!

1. lumber
   noun, dated
   
   1: A house or room; spec. one where stolen property is hidden; a house used by criminals. (1753 — 1950).
   
   2: to be in lumber:
   a: To be in prison. (1812 —) .
   J. Prescot My poor old dad was in and out of lumber all his life (1963).
   
   b: To be in trouble. (1965 —) .
   L. Henderson I've got to keep at it. Break my bloody leg or something stupid like that and I'm in lumber (1972). verb trans.
   
   
   3: To imprison, arrest. (1812 —) .
   M. Kenyon We're pros—twice in twelve years I've been lumbered....Only twice in twelve years screwing (1970).
   
   [From earlier sense, pawnbroking establishment; variant of obs. Lombard noun, pawnbroking establishment, bank, etc., from the traditional role of natives of Lombardy as bankers and pawnbrokers.]
2. lumber
   verb trans. and intr.
   
   1: Of a man: to court or chat up (a woman); to make sexual advances towards. (1960 —) .
   A. Gray 'Last Friday I saw her being lumbered by a hardman up a close near the Denistoun Palais.' 'Lumbered?' 'Groped. Felt' (1981). noun
   
   2: A woman courted, esp. one picked up at a party, etc. Also, a bit of lumber, a 'bit of stuff'. (1966 —) .
   
   [Origin uncertain; perh. related to lumber noun, useless odds and ends, verb, to encumber.]

• Large, tall, or fat
• Farming and Crops - lumbering: work and business of tree farming or felling trees to make lumber

Dansk (Danish)
1.
v. intr. - skramle, rumle, lunte, trave

2.
n. - ragelse, skrammel, gammelt skrammel
v. tr. - lægge over på
v. intr. - fylde

idioms:

• lumber yard    tømmerplads

3.
v. tr. - møde tilfældigt
n. - tilfældigt bekendtskab

Nederlands (Dutch)
timmerhout, houtvervoer, rommel, overtollig vet, rommelend geluid, hotsen, dreunen, opschepen met, overladen, op een grote hoop gooien, volproppen met rotzooi, blokkeren, hout zagen voor vervoer/verkoop, met logge tred lopen, rondstommelen

Français (French)
1.
v. intr. - avancer d'un pas lourd, avancer péniblement (en voiture)

2.
n. - (GB) bric-à-brac, (US) bois de construction
v. tr. - charger (qn) avec qch, se coltiner (qn, qch), (US) exploiter (qch) pour le bois de construction
v. intr. - (US) débiter le bois

idioms:

• lumber yard    scierie

3.
v. tr. - commencer une liaison (par hasard)
n. - liaison

Deutsch (German)
1.
v. - rumpeln, sich hinschleppen, trampeln

2.
n. - Gerümpel, Bauholz
v. - vollstopfen, überladen

idioms:

• lumber yard    Holzplatz

3.
v. - eine sexuelle Beziehung zufällig anfangen
n. - zufällige sexuelle Beziehung

Ελληνική (Greek)
n. - "σαβούρα", παλιατσούρες, (δομική) ξυλεία
v. - περπατώ βαριά ή άτσαλα και με θόρυβο, υλοτομώ

idioms:

• lumber yard    (υπαίθρια) αποθήκη ξυλείας

Italiano (Italian)
legname

idioms:

• lumber yard    deposito di legname

Português (Portuguese)
n. - madeira (f) para construção, tábuas (f pl), trastes (m pl), móveis (m pl) velhos
v. - derrubar árvores, cortar ou serrar madeira, amontoar

idioms:

• lumber yard    depósito (m) de madeira

Русский (Russian)
загромождать ненужными вещами, засорять, обременять, валить деревья, громыхать, пиломатериалы, старая мебель, обуза, касса ростовщика, деньги, полученные под залог

idioms:

• lumber yard    лесной склад

Español (Spanish)
1.
v. intr. - andar o moverse pesadamente, avanzar con ruido sordo

2.
n. - madera, trastos viejos
v. tr. - agobiar a alguien con algo
v. intr. - amontonar trastos

idioms:

• lumber yard    depósito de madera

3.
v. tr. - comenzar casualmente una relación sexual
n. - alguien que causa dificultades

Svenska (Swedish)
n. - skräp, bråte, smörja, tyngande gods, barlast, (Am.) timmer, virke
v. - (Am.) avverka (hugga, såga) timmer, lufsa, klampa, dundra, dåna, (åld.) bullra, skramla, belamra, fylla med skräp, belasta, tynga, ligga och skräpa

中文（简体）(Chinese (Simplified))
1. 木材, 木料, 堆积杂物, 破烂东西, 无用杂物, 采伐...林木, 伐, 堆满, 妨碍, 拖累, 伐木, 制材

idioms:

• lumber yard    木材堆置场, 木场

2. 笨重地移动, 隆隆地行驶

中文（繁體）(Chinese (Traditional))
1.
v. intr. - 笨重地移動, 隆隆地行駛

2.
n. - 木材, 木料, 堆積雜物, 破爛東西, 無用雜物
v. tr. - 採伐...林木, 伐, 堆滿, 妨礙, 拖累
v. intr. - 伐木, 制材

idioms:

• lumber yard    木材堆置場, 木場

한국어 (Korean)
1.
v. intr. - 육중하게 움직이다, 허둥거리다

2.
n. - 판재 , 제재목, 고물 , 잡동사니
v. tr. - 떠맡기다, 잡동사니로 채우다, 베어내다
v. intr. - 벌채하다 , 불필요해지다

3.
v. tr. - 관계를 시작하다
n. - 관계

日本語 (Japanese)
n. - 材木, がらくた
v. - 製材する, 切り出す, 押し付ける, どしんどしんと歩く

idioms:

• lumber yard    製材所

العربيه (Arabic)
‏(الاسم) سقط المتاع الأثاث الفائض أو الردئ الذي يخزن في مكان ما, خشب منشور على شكل ألواح (فعل) يملأ بأشياء مبعثرة تعوق الحركه, يعوق, يكوم على نحو مبعثر, يقطع الأخشاب وينثر خشبها, يتحرك بتثاقل, يفرقع, يقرقع‏

עברית (Hebrew)
v. intr. - ‮נע בכבדות, התקדם בטירטור, טעה טעות גסה‬
n. - ‮רהיטים ישנים לא-נחוצים, קרשים, קורות, חפצים ישנים מיותרים, גרוטאות, עץ מעובד באופן מלא או חלקי, עצים‬
v. tr. - ‮חסם, גיבב, ערם, חטב והכין עצים למישלוח, השאיר (לאדם) דבר לא רצוי או לא נעים, השאיר (אדם) במצב לא נוח‬
v. intr. - ‮מילא בגרוטאות‬
v. tr. - ‮פיתח (באופן מיקרי) יחסי-מין‬
n. - ‮יחסי-מין שהתפתחו באופן מיקרי‬

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